KR20030005783A - High-efficiency power amplifier for a mobile phone - Google Patents

Abstract

PURPOSE: A high efficiency power amplifier of a mobile terminal is provided to increase an efficiency by performing a switching operation in consideration of a feature of each element on requesting a corresponding output with respect to a plurality of areas having maximal output and usage frequency. CONSTITUTION: An MSM(Mobile Station Modem)(200) is installed at an inside of a mobile communication terminal and processes all kinds of transmitting/receiving data. An IM(Input Match)(110) matches an input signal with an internal circuit of a mobile terminal. Each of the first and second amplifiers(120,140) amplifies an output power. An amplifier matching section(130) switches and controls the first and second amplifiers(120,140) according to requests of maximal usage frequency and output. An amplification ratio controller(170) receives a signal from an output terminal of the MSM(200) and performs an amplification ratio control and a power control according to an antenna output power.

Description

High efficiency power amplifier for mobile terminal {HIGH-EFFICIENCY POWER AMPLIFIER FOR A MOBILE PHONE}

The present invention relates to a high-efficiency power amplifier for a mobile terminal, and more particularly, to a high-efficiency power amplifier for a mobile terminal to generate a maximum power efficiency due to the structure change of the power amplification circuit of the mobile terminal.

As is well known, conventional power amplifiers for mobile terminals are designed to provide maximum efficiency (about 30%) at a maximum output of 28 dBm, as shown in FIG. At 7%, most of the input power was lost to heat.

However, when the utilization rate of the output power is distributed as shown in FIG. 2 like the mobile communication terminal, there is a problem in that the power added efficiency is lowered in the A region where the actual utilization rate is high.

In addition, to increase the power amplifier efficiency, the operating point moving method (DC-DC CONVERTER), SWITCHING method and bias control method are used. However, moving point or bias control method is difficult to maintain PA linearity due to continuous change of load line, and DC-DC converter has problems such as price rise and increase in size. The transfer method has a problem of increased efficiency.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described situation of the prior art, and the efficiency of the output is generated by switching the plurality of regions having the maximum output and the maximum frequency of use in the mobile terminal in consideration of the characteristics of each element when the output is requested. The purpose is to provide a high-efficiency power amplifier for a mobile terminal with increased.

1 is a PA efficiency distribution diagram of the conexant company according to the conventional embodiment,

2 is a T-PA simulation curve according to a conventional embodiment,

3 is a block diagram showing the configuration of a high efficiency power amplifier for a mobile terminal according to a first embodiment of the present invention;

4 is a block diagram showing the configuration of a high efficiency power amplifier for a mobile terminal according to a second embodiment of the present invention;

5 is a power amplifier efficiency diagram implemented through a high efficiency power amplifier for a mobile terminal according to the first and second embodiments of the present invention,

6 is a state diagram showing a hysteresis curve of a high efficiency power amplifier for a mobile terminal according to an embodiment of the present invention;

7 is a block diagram illustrating a configuration of a high efficiency power amplifier for a mobile terminal according to a third embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100: amplification control circuit, 110: input matching unit,

120: the first amplifier, 130: amplifier matching unit,

140: second amplifier, 150: output matching unit,

160: PA detection unit, 170: amplification ratio control unit,

200: MSM chip.

In order to achieve the above object, according to a preferred embodiment of the present invention, the PA-ON, PA-R0 is provided inside the mobile communication terminal to process various transmission / reception data and output a signal for power amplification control. And MSM chips each having PA-R1 formed thereon; An input / output matching unit for matching input and output signals to an internal circuit of a mobile terminal; First and second amplifiers connected to a rear end of the input matching unit to amplify output power; An amplifier matching unit for switching and controlling the second amplifier according to the maximum frequency output and the maximum output demand in order to increase the efficiency of the PA between the first and second amplifiers; A high-efficiency power amplifier for a mobile terminal is provided comprising an amplification ratio controller configured to receive a signal from an output terminal of the MSM chip and perform power control according to an amplification ratio control and antenna output power for the first and second amplifiers.

Preferably, one end thereof is connected between the input matching unit and the first amplifier, and the other end thereof is connected to a rear end of the output matching unit to further include a PA detector configured to detect the PA to maintain linearity with respect to the output output. A high efficiency power amplifier for a mobile terminal is provided.

More specifically, the second amplifier is provided with a high efficiency power amplifier for a mobile terminal, characterized in that one or more are configured in parallel so as to adjust the power amplifier ratio by switching the amplifier matching unit.

The first amplifier and the second amplifier are each connected to their rear ends by a bypass line.

On the other hand, the switching control of the second amplifier is provided with a high efficiency power amplifier for a mobile terminal, characterized in that it can be controlled by an algorithm for controlling the amplification ratio according to a predetermined value for each power amplifier ratio .

More preferably, the switching control of the second amplifier is provided such that it can be switched by a hysteresis curve.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail with reference to drawings.

3 is a block diagram showing the configuration of a high efficiency power amplifier for a mobile terminal according to a first embodiment of the present invention.

When the mobile terminal is always used, the output of the maximum output frequency and the maximum frequency of use are required differently due to the characteristics of the mobile terminal.

Therefore, the high efficiency power amplifier for the mobile terminal according to the present invention is provided inside the mobile terminal, and doubles the efficiency by switching the switching for each element of each amplifying means into the maximum output and the maximum frequency of use, respectively. It is to let.

More specifically, the power added efficiency (PAE) of a power amplifier can be expressed as PAE (%) = (output RF power-input RF power) / input DC power * 100 where the RF power of the input and output has been fixed. The efficiency is large when the input DC power is small. According to the present invention, a large output can be produced with a small DC input power by switching a large power consumption device and a small power consumption device using the above principle.

Referring to FIG. 3, the high-efficiency power amplifier for the mobile terminal includes an MSM chip 200 and an amplification control circuit 100 therein. First, reference numeral 200 is provided inside the mobile communication terminal to provide various transmissions. / Mobile Station Modem, which is a core component of a terminal for processing received data, and the MSM chip 200 has PA-ON, PA-R0, and PA-R1 for outputting signals for power amplification control, respectively.

In addition, the amplification control circuit 100 includes an input / output matching unit, a plurality of amplifiers, an amplification control unit, and a PA detection unit, and reference numeral 110 denotes an input matching unit for matching an input signal to an internal circuit of a mobile terminal. Match).

Reference numerals 120 and 140 denote first and second amplifiers connected to the rear ends of the input matching unit 110 to amplify the output power, and reference numeral 130 denotes the first and second amplifiers 120 and 140. In order to increase the efficiency of the PA through the medium, the amplifier matching unit for switching and controlling the corresponding amplifiers 120 and 140 according to the maximum frequency output and the maximum output demand, respectively.

Reference numeral 150 denotes an output match unit connected to a rear end of the second amplifier 140 to match an output signal.

In addition, one end 160 is connected between the input matching unit 110 and the first amplifier 120, and the other end thereof is connected to the rear end of the output matching unit 150 to maintain linearity with respect to the output output. In order to show a PA, a PA detection unit is shown.

Reference numeral 170 denotes an amplification ratio control unit that receives a signal from the output terminal of the MSM chip 200 and performs power control according to the amplification ratio control and the antenna output power.

In this case, the control of the second amplifier 140 may be controlled by an algorithm for controlling the amplification ratio according to a preset value for each power amplification ratio.

The high-efficiency power amplifier for the mobile terminal having the above configuration is switched to the maximum power consumption area (maximum output) and maximum use frequency area according to the requirements by using a switching method to have maximum efficiency.

For example, when a call connection with a repeater is attempted through the mobile terminal and a time point at which the power output of the mobile terminal requires maximum output arrives, the amplification ratio controller 170 controls the first and the second according to the antenna output power. The amplifiers 120 and 140 are controlled to induce a preset output.

The amplifier matching unit 130 receives the output voltage of the first amplifier 120 to switch to the second amplifier 140 to generate a maximum output.

In this case, the PA detection unit 160 maintains linearity with respect to the output output by intervening between the first amplifier 120 and the output matching unit 150.

4 is a block diagram showing the configuration of a high efficiency power amplifier for a mobile terminal according to a second embodiment of the present invention.

Referring to this, a switching algorithm 135 is shown in the amplifier matching unit 130 to switch the second amplifier 140, and at least one of the second amplifiers 140 and 145 is shown at a rear end thereof. do.

In this case, the second amplifiers 140 and 145 are not merely formed in plural, but may be formed in at least one, and switching thereof may be performed by the switching unit 135 provided in the amplifier matching unit 130. Is done.

On the other hand, the amplifier matching unit 130 can control the switching control by the control circuit (R0, R1) of 2bit and by the high output (1, 1) medium output (1, 0) low output (0, 0) It can be controlled to maximize the efficiency of the power amplifier.

Accordingly, the switching control of at least one of the second amplifiers 140 may be controlled by the algorithm 135 that controls the amplification ratio according to a preset value for each power amplifier ratio.

5 is a power amplification efficiency diagram implemented through a high efficiency power amplifier for a mobile terminal according to the first and second embodiments of the present invention.

Referring to this, a simulation result of a PA designed to have a high efficiency at the maximum output and an intermediate output of the high efficiency power amplifier for a mobile terminal according to the present invention shows a significantly increased efficiency characteristics compared to the conventional PA.

That is, while the conventional PA has insufficient power amplification efficiency required for the frequency of use, the high efficiency power amplifier for the mobile terminal according to the present invention exhibits sufficient power amplification efficiency as shown in the T-PA curve.

6 is a state diagram showing a hysteresis curve of a high efficiency power amplifier for a mobile terminal according to an embodiment of the present invention.

Referring to this, in order to remove anxiety of power control during switching operation in a CDMA system, power control can be performed using a hystresis curve as shown in the example of FIG. 6. In this figure, A denotes a gain difference at different outputs.

7 is a block diagram illustrating a configuration of a high efficiency power amplifier for a mobile terminal according to a third embodiment of the present invention.

Referring to this, the high efficiency power amplifier for a mobile terminal according to the present invention includes at least one or more second amplifiers 140 formed therein, and is configured to perform switching control therefor in the amplifier matching unit 130. It is also possible, but as illustrated in FIG. 7, it is also possible to bypass the first amplifier 120 and the second amplifier 140 to perform amplification control.

On the other hand, the high efficiency power amplifier for a mobile terminal according to an embodiment of the present invention is not limited to the above embodiment, but various modifications can be made without departing from the technical gist of the present invention.

For example, the high efficiency power amplifier for the mobile terminal is not only used for the mobile communication terminal, but can be sufficiently used for various electronic products requiring a variable output value according to the characteristics of the internal circuit.

As described above, the high-efficiency power amplifier for mobile terminals according to the present invention changes the switching scheme of the power amplifier, which is designed so that the existing power amplifier can increase efficiency only at the maximum output. It is designed to have maximum efficiency in output. In the case of mobile communication terminal, it is designed to have maximum efficiency in the area with the highest frequency of use, which can increase the talk time of mobile communication terminal more than 4 times from 1 hour to maximum 4 hours. have.

Claims (6)

An MSM chip provided inside the mobile communication terminal and configured to process various transmit / receive data and output signals for power amplification control, respectively; An input / output matching unit for matching input and output signals to an internal circuit of a mobile terminal; First and second amplifiers connected to a rear end of the input matching unit to amplify output power; An amplifier matching unit for switching and controlling the second amplifier according to the maximum frequency output and the maximum output demand in order to increase the efficiency of the PA between the first and second amplifiers; And an amplification ratio control unit configured to receive a signal from an output terminal of the MSM chip and perform power control according to amplification ratio control and antenna output power for the first and second amplifiers. 2. The PA detection unit of claim 1, wherein one end is connected between the input matching unit and the first amplifier, and the other end is connected to a rear end of the output matching unit to detect a PA to maintain linearity with respect to an output output. High efficiency power amplifier for a mobile terminal, characterized in that it is included. The high efficiency power amplifier of claim 1, wherein one or more second amplifiers are configured in parallel so as to adjust the power amplifier ratio by switching the amplifier matching unit. The high efficiency power amplifier for a mobile terminal according to claim 1, wherein the first amplifier and the second amplifier are respectively connected to their rear ends by a bypass line. 2. The high efficiency power for a mobile terminal according to claim 1, wherein the switching control of the second amplifier can be controlled by an algorithm for controlling the amplification ratio according to a preset value for each power amplification ratio. amplifier. 2. The high efficiency power amplifier of claim 1, wherein the switching control of the second amplifier can be switched by a hysteresis curve.